Go 2 It continues with the ongoing saga of the GE Model XM7 GBBR, a journey that has clearly tested his patience and sanity. After a lengthy hiatus attributed mostly to laziness and a crowded hobby schedule, he reveals that the rifle is finally in working order. This feat required replacing a "Frankenstein" assortment of incorrect factory parts, including a mangled bolt catch and a proprietary nozzle retainer that was far too small for the job.